Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0853c1db7453ee…

MALICIOUS

PDF

93.2 KB Created: 2021-09-19 12:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a12b3f7a2647c94fe578154c0990123a SHA-1: a15528c1f1f7cade9bc99da224c5a3ca799f4e95 SHA-256: af0853c1db7453eea9bf795f522442fd25efc03bbbda2c498965ee12fd29c1a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=mini+militia+guns+mod+apk+download PDF link annotation
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/obo9f4ctj4jdjc6k6its6t1s24/38899391414.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/gorabidizikewilobutip.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/19310937383.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/17520023839.pdfIn PDF document text
    • https://kopari.hu/files/file/nugikujikixezigosotixuz.pdfIn PDF document text
    • https://digireg.cz/upload/numekobiribararetatawizo.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/tawibex.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/mamazosuwilatovobapi.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/99966821385.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/nepazaf.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/88115789886.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/8a2d655055308ea32bd54fb64988a985/40634090681.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/bonemazatefume.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/76063872851.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/fidifogejon.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/gukesezaxe.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/34541817827.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/2030323761.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44274883850.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/vidazubojekakuxutebel.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/43286840780.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/bazukowisorojosobuzarefuv.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/32201860320.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/99217459437.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D2 10772 bytes
SHA-256: 080226c160e4521f3328d220488a4b70dd99ce21eb840184dbba9570161375f5
font_01_sfnt_off00011f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13781 18560 bytes
SHA-256: b51536abf7258c103d636e996a3699038448c66cb9543150fb6492749c99f796

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